<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<!-- 准备好一个“容器” -->
<div id="test"></div>

<!-- 引入react核心库 -->
<script type="text/javascript" src="../js/react.development.js"></script>
<!-- 引入react-dom，用于支持react操作DOM -->
<script type="text/javascript" src="../js/react-dom.development.js"></script>
<!-- 引入babel，用于将jsx转为js -->
<script type="text/javascript" src="../js/babel.min.js"></script>

<script type="text/babel">

    //生命周期回调函数 <=> 生命周期钩子函数 <=> 生命周期函数 <=> 生命周期钩子
    //创建组件
    class Life extends React.Component{

        state = {opacity:1}

        death = ()=>{
            // 卸载组件
            ReactDOM.unmountComponentAtNode(document.getElementById('test'))

        }
        //组件挂完毕调用
        componentDidMount(){
            this.timer = setInterval(() => {
                //获取原状态
                let {opacity} = this.state
                //减小0.1
                opacity -= 0.1
                if (opacity <= 0) opacity = 1
                //设置新的透明度
                this.setState({opacity})
            }, 200);
        }

        // 组件要卸载
        componentWillUnmount(){
            // 清除定时器
            clearInterval(this.timer)
        }
        //初始化渲染、状态更新之后调用
        render(){
            return(
               <div>
                   <h2 style={{opacity:this.state.opacity}}>蕾蕾追不上怎么办</h2>
                   <button onClick={this.death}>死去吧</button>
               </div>
            )
        }
    }
    //渲染组件
    ReactDOM.render(<Life/>,document.getElementById('test'))
</script>
</body>
</html>